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By 1965, atmospheric C concentrations were double their pre "atomic age" values.

Coal and petroleum are the fuels that powered the Industrial Revolution.

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This activity reached its peak in the early 1960s when an atmospheric blast occurred somewhere on earth every two to three days.

Nuclear bombs generate large numbers of high energy neutrons, which can in turn transmute nitrogen 14 into carbon 14 in exactly the same way as naturally occurring secondary cosmic rays.

Every time a living being dies a stopwatch starts ticking. is used to determine the age of previously living things based on the abundance of an unstable isotope of carbon.

The isotopic distribution of carbon on the Earth is roughly 99% carbon 12 (with 6 protons and 6 neutrons) and 1% carbon 13 (with 6 protons and 7 neutrons).

Potassium-argon dating is used to determine the age of igneous rocks based on the ratio of an unstable isotope of potassium to that of argon.